wallywombat:Zoomup:I have seen many local cases of damage due to long sustained overvoltages when an S.P.D. probably would not have helped. Perhaps they are good for short transient overvoltages but for a long term fault I do not think so.
I don't think anyone is claiming that type 2 SPDs are intended for anything other than for very brief (~ 10 microsec) transients of the sort generated by e.g. lighting strikes on or near the distribution system further upstream
That is exactly my point. They are overpriced, over rated, and of very limited merit.
Z.
wallywombat:Zoomup:I have seen many local cases of damage due to long sustained overvoltages when an S.P.D. probably would not have helped. Perhaps they are good for short transient overvoltages but for a long term fault I do not think so.
I don't think anyone is claiming that type 2 SPDs are intended for anything other than for very brief (~ 10 microsec) transients of the sort generated by e.g. lighting strikes on or near the distribution system further upstream
That is exactly my point. They are overpriced, over rated, and of very limited merit.
Z.
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